linux-kernel - Re: Oops in UHCI when encountering "host controller process error"

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Message-ID: <49401540.8030609@goop.org>
Date:	Wed, 10 Dec 2008 11:15:12 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>
Subject: Re: Oops in UHCI when encountering "host controller process error"

Alan Stern wrote:
> The entry point is uhci_urb_enqueue().  You can do whatever you like 
> there, but bear in mind that it may be called in interrupt context.  
> uhci_sprint_schedule() should be fine.
>
> However I don't really see the point.  If the DMA pool allocations are 
> so badly messed up that the initial setup is wrong, why bother to 
> search any further?

I was trying to use it as a way of gauging where the damage was coming from.

But its moot now; Ian Campbell tracked it down to a missing TLB flush 
which explained all the weird non-deterministic symptoms we were 
seeing.  It all looks pretty good now.

    J

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